mongodb - 基于mongoose js中字段的条件查询获取文档

Question

我有这样的模型

const schema = new mongoose.Schema({
  locationtype: String,        // one of "all","locationstoshow","locationsnottoshow"
  locations: [{
    location_country: String,
    location_state: String,
    location_city: String
  }]
});

export default mongoose.model("AdPost", schema);

现在我有了当前用户的国家、州和城市的值。我想获得那些满足这些条件的广告文件-

如果 locationtype 为“all”，则应返回所有文档，

如果 locationtype 为“locationstoshow”，则应检查每个文档是否允许当前用户的国家、州和城市。如果是，它们应该被退回。否则不是。

如果 locationtype 是“locationsnottoshow”，那么每个文档都应该检查用户的位置是否不包含在位置中并返回它。否则不是。

请注意，如果未提及城市（即 location_city: ""）并且位置中提及了州和国家，则检查用户的国家和州，如果仅提及国家，则城市和州为“”。然后，匹配用户的国家。

我在想这样的事情，但它没有给出正确的结果。

let query = [{
        "$cond": {
            "if": {
                "$eq": [ "locationtype", "all" ]
            },
            "then": {
                "$match": [{
                    "$cond": {
                        "if": {
                            "$neq": [ "locations.location_city", "" ]
                        },
                        "then": {
                            "$neq": [ "locations.location_city", "" ]
                        },
                        "else": {
                            "if": {
                                "$neq": [ "locations.location_state", "" ]
                            },
                            "then": {
                                "$eq": [ "locations.location_state", "" ]
                            },
                            "else": {
                                "$eq": [ "locations.location_country", "" ]
                            }
                        }
                    }
                }]
            },
            "else": {
                "if": {
                    "$eq": [ "locationtype", "locationstoshow" ]
                },
                "then": {
                    "$match": [{
                        "$cond": {
                            "if": {
                                "$neq": [ "locations.location_city", "" ]
                            },
                            "then": {
                                "$eq": [ "locations.location_city", `${city}` ]
                            },
                            "else": {
                                "if": {
                                    "$neq": [ "locations.location_state", "" ]
                                },
                                "then": {
                                    "$eq": [ "locations.location_state", `${state}` ]
                                },
                                "else": {
                                    "$eq": [ "locations.location_country", `${country}` ]
                                }
                            }
                        }
                    }]
                },
                "else": {
                    "if": {
                        "$eq": [ "locationtype", "locationsnottoshow" ]
                    },
                    "then": {
                        "$match": [{
                            "$cond": {
                                "if": {
                                    "$neq": [ "locations.location_city", "" ]
                                },
                                "then": {
                                    "$neq": [ "locations.location_city", `${city}` ]
                                },
                                "else": {
                                    "if": {
                                        "$neq": [ "locations.location_state", "" ]
                                    },
                                    "then": {
                                        "$neq": [ "locations.location_state", `${state}` ]
                                    },
                                    "else": {
                                        "$neq": [ "locations.location_country", `${country}` ]
                                    }
                                }
                            }
                        }]
                    },  
                }
            }
        }
    }];

const options = {
    limit: 10,
    page: pageNo
}

AdPost.aggregatePaginate(query, options).then(docs => {
    res.json({ docs });
}).catch(err => {
    res.status(400).json({ errors: err });
})

标签： mongodbmongooseconditional